KR101270542B1 - Variable capacity rotary compressor and air conditioning cycle having the same - Google Patents

Abstract

The present invention relates to a variable displacement rotary compressor including a first compression chamber in which compression and idling of a refrigerant are selectively performed, a second compression chamber in which compression of a refrigerant is performed, and an air conditioning cycle having the same. It is installed to be movable and the first vane to perform the compression of the refrigerant in the first compression chamber when moving forward, and the idling is carried out in the first compression chamber during the reverse, and the rear of the first vane and the high-pressure side of the air conditioning cycle A second compression unit in a state in which idle operation is performed in the first compression chamber by being installed on a vane control unit selectively communicating with any one of the low pressure sides to move the first vane forward and backward, and on a flow path for guiding the refrigerant to the first compression chamber; Including a backflow prevention unit for preventing the refrigerant in the chamber from flowing back through the first compression chamber to the suction side of the air conditioning cycle, the idling is to be performed in the first compression chamber. Yiwu also has the effect of being able to prevent the refrigerant from flowing back to the accumulator is in the first compression chamber.

Description

VARIABLE CAPACITY ROTARY COMPRESSOR AND AIR CONDITIONING CYCLE HAVING THE SAME}

The present invention relates to a variable displacement rotary compressor and an air conditioning cycle having the same, and more particularly, a capacity capable of varying a capacity by selectively performing compression and idling of a refrigerant in a compression chamber of a pair of compression chambers. A variable rotary compressor and an air conditioning cycle having the same.

In general, a rotary compressor is an apparatus used for compressing a refrigerant by being applied to an air conditioning cycle. In recent years, there is a variable displacement rotary compressor capable of changing a capacity so as to efficiently respond to various refrigeration loads.

Korean Patent Publication No. 10-2008-0016349 discloses a conventional variable displacement rotary compressor. Such a conventional variable displacement rotary compressor is provided with a drive device 20 for generating a rotational force in the sealed container 10, and a compression device 30 for compressing the refrigerant by receiving the rotational force from the drive device as shown in FIG. It is.

The drive device 20 includes a stator 21 fixedly installed on an inner surface of the sealed container 10, a rotor 22 rotatably installed inside the stator 21, and one end of the rotor 22. Fixed and the other end is provided in the compression device 30 includes a rotary shaft 23 for transmitting the rotational force generated in the drive device 20 to the compression device 30, the compression device 30 is the compression of the refrigerant is being performed A second cylinder (31) provided with a first compression chamber (31a) for selectively compressing and idling the refrigerant in a state and a second compression chamber (32a) for continuously compressing the refrigerant ( 32 and the first flange 33 and the second flange (33) for rotatably supporting the rotating shaft 23 while closing the upper portion of the first compression chamber 31a and the lower portion of the second compression chamber 32a, respectively. 34 and an intermediate play disposed between the first cylinder 31 and the second cylinder 32 to partition the first compression chamber 31a and the second compression chamber 32a. And a 35. In addition, the 1st roller 36 and the 2nd roller 37 which eccentrically rotate, the 1st compression chamber 31a, and the 2nd compression chamber 32a are located in the 1st compression chamber 31a and the 2nd compression chamber 32a. ) Are respectively provided with a first vane 38 and a second vane 39 which divide the refrigerant into a suction part into which the refrigerant is sucked and a compression part into which the refrigerant is compressed.

In addition, such a conventional variable displacement rotary compressor changes the pressure applied to the rear of the first vane 38 so as to control the forward and backward movement of the first vane 38, thereby moving the first vane 38 forward and backward. The vane control device 50 is provided so that the capacity of the variable displacement rotary compressor is variable by allowing compression and idling to be selectively performed. That is, the high pressure is applied to the rear of the first vane 38 so that the first vane 38 is advanced into the first compression chamber 31a to compress the refrigerant in the first compression chamber 31a, or The low pressure is applied to the rear of the first vane 38 so that the first vane 38 is retracted from the first compression chamber 31a to perform idling in the first compression chamber 31a.

However, in such a conventional variable displacement rotary compressor, since the parts of the compression apparatus are minutely spaced apart so that the rotating shaft, the first roller, and the second roller can rotate, idle rotation is performed in the first compression chamber so that the low pressure state is achieved. In this case, a portion of the high temperature and high pressure refrigerant compressed in the second compression chamber through the spaced parts is flowed back to the accumulator through the low pressure first compression chamber, thereby performing the performance of the variable displacement rotary compressor. In addition to the deterioration, the refrigerant inside the accumulator is heated by the high temperature and high pressure refrigerant flowing back from the second compression chamber, so that the density decreases and the volume increases, thereby reducing the amount of the refrigerant sucked into the second compression chamber, thereby changing the capacity variable rotation. There is a problem that the performance degradation of the compressor occurs.

The present invention is to solve the above-mentioned problems of the prior art, an object of the present invention is to prevent the high-pressure refrigerant compressed in the second compression chamber to flow back to the suction side of the air conditioning cycle through the first compression chamber of low pressure due to idling. To provide a variable displacement rotary compressor and an air conditioning cycle with the same.

The present invention for achieving the above object, in the capacity variable rotary compressor including a first compression chamber in which the compression and idling of the refrigerant is selectively performed, and a second compression chamber in which the refrigerant is compressed, the first compression chamber The first vane and the rear of the first vane is installed so as to move forward and backward, and the refrigerant is compressed in the first compression chamber during the forward movement and the idling is performed in the first compression chamber during the reverse movement. A vane control unit which selectively communicates with any one of the high pressure side and the low pressure side of the air conditioning cycle to move the first vane forward and backward, and is installed on the flow path for guiding the refrigerant into the first compression chamber, and idling in the first compression chamber. Backflow prevention unit for preventing the refrigerant of the second compression chamber from flowing back to the suction side of the air conditioning cycle through the first compression chamber in the state of being performed. It characterized in that it comprises.

The vane control unit may further include a first refrigerant pipe communicating with the high pressure side of the air conditioning cycle, a second refrigerant pipe communicating with the low pressure side of the air conditioning cycle, and one end of which is connected to the rear of the first vane and the other end of the vane control unit. A third refrigerant pipe selectively connected to any one of the first refrigerant pipe and the second refrigerant pipe, and a passage for allowing the third refrigerant pipe to be selectively connected to any one of the first refrigerant pipe and the second refrigerant pipe. It characterized in that it comprises a switching valve.

The apparatus may further include a discharge tube guiding discharge of the compressed high-pressure refrigerant, wherein one end of the first refrigerant tube is connected to the discharge tube.

The apparatus may further include an accumulator configured to allow the refrigerant in the liquid state to vaporize into the first compression chamber and the second compression chamber, and one end of the second refrigerant pipe may be connected to the suction side of the accumulator. .

The apparatus may further include a first suction pipe for guiding the refrigerant sucked into the first compression chamber, wherein the backflow preventing unit is installed in the first suction pipe.

In addition, the middle of the first suction pipe is bent in a reverse U-shape, the backflow prevention unit is installed in a portion that is bent in the reverse U-shape of the first suction pipe.

In addition, an accumulator for allowing a liquid refrigerant to be vaporized and then introduced into the first compression chamber and the second compression chamber, and one end thereof protruded into the accumulator to be sucked into the first compression chamber. It further comprises a first suction pipe, wherein the backflow prevention unit is characterized in that it is installed on one end of the first suction pipe protruding into the accumulator.

In addition, the first compression chamber is formed and further includes a first cylinder having a first suction port is formed on one side to allow the refrigerant to be sucked into the first compression chamber, the backflow prevention unit is installed in the first suction port It is characterized by.

In addition, the backflow prevention unit is a valve seat is provided with a communication hole in the center side so that the refrigerant flows through, the valve plate is formed in a plate shape so as to move forward and backward toward the valve seat, and formed in the pin shape And a stopper for limiting the moving distance of the valve plate, wherein the outer side of the valve plate is provided with a support part supported on the inner surface of the flow path and a through part spaced apart from the inner surface of the flow path so as to flow through the refrigerant. do.

In addition, the air conditioning cycle according to the present invention is installed so as to move forward and backward with respect to the first compression chamber, the compression chamber and the second compression chamber in which the compression of the refrigerant is selectively performed, and the first compression chamber, In the first compression chamber, the refrigerant is compressed in the first compression chamber, and when reversing, the first vane to perform the idling in the first compression chamber, and the rear of the first vane is any one of the high pressure side and the low pressure side of the air conditioning cycle A vane control unit that selectively communicates with the first vane to move the first vane forward and backward; And a backflow prevention unit for preventing the refrigerant in the chamber from flowing back to the suction side of the air conditioning cycle through the first compression chamber.

As described above, in the variable displacement rotary compressor according to the present invention, the rear of the first vane communicates with any one of the high pressure side and the low pressure side of the air conditioning cycle, and the pressure variable rotation compressor is provided by the pressure difference between the first pressure chamber and the rear side of the first vane. Since the vane moves forward and backward, idling is performed at a low pressure in the first compression chamber, and a backflow prevention unit is disposed on a flow path connecting the first compression chamber and the accumulator, so that the second compression is performed even when idling is performed in the first compression chamber. Backflow of the refrigerant in the chamber to the accumulator through the first compression chamber is prevented.

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to the drawings.

The variable displacement rotary compressor according to the present invention is a device which is applied to an air conditioning cycle and used to compress a refrigerant, as shown in FIG. 2, and a driving device for generating a rotational force inside an airtight container 10 forming an appearance ( 20 and a compression device 30 that receives power from the driving device 20 and compresses the refrigerant, and one side of the sealed container 10 does not evaporate in an evaporator (not shown) which is a component of an air conditioning cycle. The accumulator 40 is installed to allow the refrigerant delivered in the liquid state to be introduced into the compression device 30 after being vaporized.

The drive device 20 includes a cylindrical stator 21 fixed to an inner surface of the sealed container 10, a rotor 22 rotatably installed inside the stator 21, and one end of the rotor 22. ) And the other end is installed in the compression device 30 includes a rotating shaft 23 for transmitting the rotational force generated in the drive device 20 to the compression device (30).

As shown in Figs. 3 and 4, the compression device 30 includes a first cylinder 31 and a second cylinder 32, each of which is provided with a first compression chamber 31a and a second compression chamber 32a. ) And a first flange 33 and a second flange 34 for rotatably supporting the rotating shaft 23 while closing the upper portion of the first compression chamber 31a and the lower portion of the second compression chamber 32a. And an intermediate plate 35 disposed between the first cylinder 31 and the second cylinder 32 to partition the first compression chamber 31a and the second compression chamber 32a. In this embodiment, the first compression chamber 31a and the second compression chamber 32a are formed to have the same volume, so that when the refrigerant is compressed in the first compression chamber 31a, the variable displacement rotary compressor according to the present invention. Is operated at 100% capacity, and when the idling is performed in the first compression chamber 31a, the variable displacement rotary compressor according to the present invention operates at 50% capacity.

In the first compression chamber 31a and the second compression chamber 32a, a first roller 36 and a second roller 37 for eccentrically rotating and compressing a refrigerant by receiving a rotational force from the rotation shaft 23 are disposed. The center of rotation of the rotary shaft 23 is provided on the rotary shaft 23 so that the first roller 36 and the second roller 37 can be eccentrically rotated in the first compression chamber 31a and the second compression chamber 32a. The first eccentric portion 23a and the second eccentric portion 23b formed so as to be eccentric with respect to each other are provided so that the first roller 36 is rotatably installed outside the first eccentric portion 23a and the second eccentric portion 23b. The second roller 37 is rotatably installed on the outside of the.

The upper side of the sealed container 10 is provided with a discharge tube 11 for discharging the refrigerant compressed therein, the lower one side of the sealed container is the first compression chamber (31a) and the second compression chamber (32a) The first suction pipe 12 and the second suction pipe 13 are respectively provided with the refrigerant to be compressed in the suction. At this time, the first suction pipe 12 and the second suction pipe 13 are connected to the first cylinder 31 and the second cylinder 32, respectively, and are transmitted through the first suction pipe 12 and the second suction pipe 13. A first suction port 31b and a second suction port 32b for allowing refrigerant to be sucked into the first compression chamber 31a and the second compression chamber 32a are provided, respectively, and the first flange 33 and the second suction port 32b are provided. The flange 34 has a first discharge port 33a and a second discharge port that allow the refrigerant compressed in the first compression chamber 31a and the second compression chamber 32a to be discharged into the inner space of the sealed container 10, respectively. 34a is provided.

In the first compression chamber 31a and the second compression chamber 32a, the interior of the first compression chamber 31a and the second compression chamber 32a serves as a portion where the refrigerant is compressed and a portion where the refrigerant is sucked in. A first vane 38 which is supported by the first roller 36 and moves forward and backward in the radial direction of the first roller 36 and partitions the first compression chamber 31a so as to be partitioned, respectively; The second vane 39, which is elastically supported by the elastic member 39a so as to be supported by the second roller 37, moves forward and backward in the radial direction of the second roller 37 and partitions the second compression chamber 32a, And a first guide groove 31c and a second guide groove (not shown) in which the first vane 38 and the second vane 39 are installed in the first cylinder 31 and the second cylinder 32 so as to move forward and backward. 32c) are provided respectively.

Referring again to FIG. 2, the variable displacement rotary compressor according to the present invention selectively controls compression and idle of the refrigerant in the first compression chamber 31a by controlling the forward and backward movement of the first vane 38 to change its capacity. It is provided with a vane control unit 50 to enable.

The vane control unit 50 allows any one of the high pressure side and the low pressure side of the air conditioning cycle to selectively communicate with the rear of the first vane 38, so that the vane control unit 50 is located between the rear side of the first vane 38 and the first compression chamber 31a. The first vane 38 is advanced into the first compression chamber (31a) or back from the first compression chamber (31a) by the pressure difference of the first vane 38 to the first compression chamber (31a) In the advanced state, the tip of the first vane 38 is supported by the first roller 36 so that the inside of the first compression chamber 31a is sucked into the refrigerant by the first vane 38 and the refrigerant is compressed. Since the refrigerant is compressed in the first compression chamber 31a, the tip of the second vane 39 is the first roller in the state where the first vane 38 is moved backward from the first compression chamber 31a. Since the interior of the first compression chamber 31a is not separated from the space 36, the idling is performed in the first compression chamber 31a.

To this end, the vane control unit 50 includes a first refrigerant pipe 51 connected to the high pressure side of the air conditioning cycle, a second refrigerant pipe 52 connected to the low pressure side of the air conditioning cycle, and one end of the first vane ( 38, the third refrigerant pipe (53) connected to the rear of the flow path switching so that the third refrigerant pipe (53) is selectively connected to any one of the first refrigerant pipe 51 and the second refrigerant pipe (52) Valve 54. In this embodiment, one end of the first refrigerant pipe 51 is connected to the discharge pipe 11, and one end of the second refrigerant pipe 52 is connected to the suction side flow path of the accumulator 40, and the first refrigerant is connected to the first refrigerant pipe 51. The other ends of the pipe 51, the second refrigerant pipe 52 and the third refrigerant pipe 53 are connected to the flow path switching valve 54, respectively.

Therefore, when the third refrigerant pipe 53 is connected to the first refrigerant pipe 51 by the flow path switching valve 54 and the rear of the first vane 38 communicates with the high pressure side of the air conditioning cycle, the first vane Since a relatively large pressure acts on the rear side of the first compression chamber 31a compared to the first compression chamber 31a, the first vane 38 moves to the first compression chamber 31a along the first guide groove 31c due to the pressure difference. The front end is supported by the first roller 36 to advance and partitions the first compression chamber 31a, whereby the refrigerant is compressed in the first compression chamber 31a. In addition, when the third refrigerant pipe 53 is connected to the second refrigerant pipe 52 by the flow path switching valve 54 and the rear of the first vane 38 communicates with the low pressure side of the air conditioning cycle, the first vane Since a relatively small pressure acts on the rear of the first compression chamber 31a compared to the first compression chamber 31a, the first vane 38 moves from the first compression chamber 31a along the first guide groove 31c by the pressure difference. It retracts and is spaced apart from the first roller 36, so that idling is performed in the second compression chamber 32a.

In addition, the variable displacement rotary compressor according to the present invention is installed on the flow path for guiding the refrigerant to the first compression chamber (31a) and the inside of the sealed container (10) in the process of idling in the first compression chamber (31a) is performed. 2 The backflow prevention unit 60 is installed to prevent the high pressure refrigerant inside the compression chamber 32a from flowing back to the accumulator 40 through the first compression chamber 31a and the first refrigerant pipe 51. .

As shown in FIG. 5, the backflow prevention unit 60 has a valve seat 61 having a communication hole 61a provided therein so as to allow the refrigerant to flow therethrough, and is formed in a plate shape and directed toward the valve seat 61. The valve plate 62 is installed to be capable of moving forward and backward according to the flow direction of the refrigerant, and the central side portion of the valve plate 62 opens and closes the communication hole 61a, and a pin shape for limiting the moving distance of the valve plate 62. Stopper 63 is provided on a flow path in which valve plate 62 is provided. At this time, the outer side of the valve plate 62 is supported on the inner surface of the flow path in which the backflow prevention unit 60 is installed so as to move forward and backward so that the valve plate 62 can be installed to move forward and backward on the flow path (62a) ) And a through portion 62b spaced apart from the inner surface of the flow path to allow the refrigerant to pass therethrough through the inner surface of the flow path. In the present embodiment, the valve plate 62 is formed in a substantially triangular plate shape to form a support portion 62a, the corner portion of which is supported on the inner surface of the flow path, and the surface portion of which forms the through portion 62b.

In addition, in the present embodiment, the first suction pipe 12 is bent in an inverted U-shape in the middle thereof, and the backflow prevention unit 60 is installed at a portion that is bent in an inverted U-shape as described above. When the reverse flow prevention unit 60 is installed at the portion of the first suction pipe 12 that is bent in the reverse U-shape, the valve plate 62 moves forward and backward in the gravity direction, that is, forward and backward movement. The noise produced by the movement of 62 is minimized.

As a result of comparing the variable displacement rotary compressor without the reverse flow prevention unit 60 and the variable displacement rotary compressor with the reverse flow prevention unit 60 through experiments, the reverse flow prevention unit 60 was not installed. Assuming that the capacity of the variable speed rotary compressor is 100% and the EER is 100%, respectively, the capacity of the variable capacity rotary compressor equipped with a backflow prevention unit is 104.7% and the EER is 104.5%, respectively, with a performance improvement of 4.7% and 4.5%. Could confirm.

In the present embodiment, the backflow prevention unit 60 is installed at a portion of the first suction pipe 12 which is bent in a reverse U shape, but is not limited thereto. The accumulator 40 and the second compression chamber 32a are not limited thereto. It is installed anywhere in the flow path connecting the can prevent the backflow of the refrigerant. That is, as shown in FIG. 6, the backflow prevention unit 60 is installed at the first suction port 31b provided in the first cylinder 31, or as shown in FIG. 7. It is also possible to be installed on one end of the first suction pipe 12 protruding into the accumulator 40.

In the above embodiments, the first compression chamber 31a and the second compression chamber 32a are formed to have the same volume so that the capacity of the variable displacement rotary compressor can be adjusted to 50% or 100%, but is not limited thereto. Instead, the volume of the first compression chamber 31a and the second compression chamber 32a may be formed differently so that the capacity of the variable displacement rotary compressor can be adjusted in various ways.

In addition, in the above embodiment, the capacity variable rotation compressor can adjust the capacity to 50% or 100%, but not limited thereto, and can freely adjust the capacity of the capacity variable rotation compressor between 50% -100% through PWM control. It is possible to do so.

1 is a longitudinal sectional view of a conventional variable displacement rotary compressor.

2 is a longitudinal sectional view of the capacity variable rotary compressor according to the first embodiment of the present invention.

3 is a plan sectional view showing a first compression chamber of the capacity variable rotary compressor according to the first embodiment of the present invention.

4 is a plan sectional view showing a second compression chamber of the variable displacement rotary compressor according to the first embodiment of the present invention.

5 is a perspective view showing a backflow prevention unit applied to a capacity variable rotary compressor according to a first embodiment of the present invention.

Figure 6 is a plan sectional view showing the installation structure of the backflow prevention unit applied to the variable displacement rotary compressor according to the second embodiment of the present invention.

7 is a longitudinal sectional view showing the installation structure of the backflow prevention unit applied to the variable displacement rotary compressor according to the third embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10: sealed container 11: discharge tube

12: first suction pipe 13: second suction pipe

30: compression device 31: first cylinder

31a: first compression chamber 31b: first suction port

32: 2nd cylinder 32a: 2nd compression chamber

32b: second suction port 36: first roller

37: 2nd roller 38: 1st vane

39: 2nd vane 40: accumulator

50: vane control unit 51: the first refrigerant pipe

52: second refrigerant pipe 53: third refrigerant pipe

54: flow path switching valve 60: backflow prevention unit

61: valve seat 62: valve plate

63: stopper

Claims (18)

In a capacity variable rotary compressor including a first compression chamber in which the compression and idling of the refrigerant is selectively performed, and a second compression chamber in which the refrigerant is compressed, A first vane installed so as to move forward and backward with respect to the first compression chamber, and to compress the refrigerant in the first compression chamber when moving forward and to perform idling in the first compression chamber when moving backward; A vane control unit configured to selectively communicate the rear of the first vane with any one of the high pressure side and the low pressure side of the air conditioning cycle to move the first vane forward and backward; It is provided on the flow path for guiding the refrigerant to the first compression chamber, the refrigerant in the second compression chamber flows back to the suction side of the air conditioning cycle through the first compression chamber in the state that idling is performed in the first compression chamber. It includes a backflow prevention unit to prevent, The backflow prevention unit has a valve seat provided with a communication hole at the center side to allow the refrigerant to flow therethrough, a valve plate which is formed in a plate shape so as to move forward and backward toward the valve seat, and is formed in a pin shape and the valve plate. Includes a stopper to limit the travel distance of The outer side of the valve plate is provided with a support portion supported on the inner surface of the flow path, and a through-part spaced apart from the inner surface of the flow path so that the refrigerant flows through. The method of claim 1, The vane control unit includes a first refrigerant pipe communicating with the high pressure side of the air conditioning cycle, a second refrigerant pipe communicating with the low pressure side of the air conditioning cycle, and one end of which is connected to the rear of the first vane and the other end of the first refrigerant pipe. A third refrigerant pipe selectively connected to any one of the pipe and the second refrigerant pipe, and a flow path switching valve for selectively connecting the third refrigerant pipe to any one of the first refrigerant pipe and the second refrigerant pipe. Capacity variable rotation compressor comprising a. The method of claim 2, Further comprising a discharge pipe for guiding the discharge of the compressed high-pressure refrigerant, And a first end of the first refrigerant pipe is connected to the discharge pipe. The method of claim 2, And accumulating the liquid refrigerant into the first compression chamber and the second compression chamber after vaporizing the refrigerant. And one end of the second refrigerant pipe is connected to the suction side of the accumulator. The method of claim 1, Further comprising a first suction pipe for guiding the refrigerant sucked into the first compression chamber, The reverse flow prevention unit is a variable displacement rotary compressor, characterized in that installed in the first suction pipe. 6. The method of claim 5, The middle of the first suction pipe is bent in a reverse U-shape, the backflow prevention unit is installed in a portion that is bent in the reverse U-shape of the first suction pipe, characterized in that the variable displacement rotary compressor. The method of claim 2, Accumulator that vaporizes the liquid refrigerant into the first compression chamber and the second compression chamber, and one end thereof protrudes into the accumulator to guide the refrigerant sucked into the first compression chamber. Further comprising a first suction pipe, And the backflow prevention unit is installed at one end of the first suction pipe protruding into the accumulator. The method of claim 1, The first compression chamber is formed and further includes a first cylinder having a first suction port is formed on one side to allow the refrigerant to be sucked into the first compression chamber, The reverse flow prevention unit is a variable displacement rotary compressor, characterized in that installed in the first suction port. delete A first compression chamber in which the compression and idling of the refrigerant are selectively performed, a second compression chamber in which the refrigerant is compressed, and a first compression chamber is installed so as to move forward and backward with respect to the first compression chamber, The first vane to allow compression to be carried out and to perform idling in the first compression chamber when reversing, and the rear of the first vane is selectively communicated with any one of the high pressure side and the low pressure side of the air conditioning cycle to the first vane. The vane control unit for moving the vane forward and backward, and the refrigerant in the second compression chamber is installed on the flow path for guiding the refrigerant to the first compression chamber, and the refrigerant in the second compression chamber is performed in the first compression chamber. It includes a backflow prevention unit for preventing backflow to the suction side of the air conditioning cycle through, The backflow prevention unit has a valve seat provided with a communication hole at the center side to allow the refrigerant to flow therethrough, a valve plate which is formed in a plate shape so as to move forward and backward toward the valve seat, and is formed in a pin shape and the valve plate. Includes a stopper to limit the travel distance of An outer side of the valve plate is provided with a support part supported on the inner surface of the flow path and a through part spaced apart from the inner surface of the flow path to allow the refrigerant to pass therethrough. 11. The method of claim 10, The vane control unit includes a first refrigerant pipe communicating with the high pressure side of the air conditioning cycle, a second refrigerant pipe communicating with the low pressure side of the air conditioning cycle, and one end of which is connected to the rear of the first vane and the other end of the first refrigerant pipe. A third refrigerant pipe selectively connected to any one of the pipe and the second refrigerant pipe, and a flow path switching valve for selectively connecting the third refrigerant pipe to any one of the first refrigerant pipe and the second refrigerant pipe. An air conditioning cycle comprising a. The method of claim 11, Further comprising a discharge pipe for guiding the high-pressure refrigerant discharged from the air conditioning cycle, And one end of the first refrigerant pipe is connected to the discharge pipe. The method of claim 11, An accumulator disposed on a suction side of the air conditioning cycle to expand the pressure under reduced pressure before the refrigerant flows into the first compression chamber and the second compression chamber, And one end of the second refrigerant pipe is connected to a suction side flow path of the accumulator. The method of claim 11, Further comprising a first suction pipe for guiding the refrigerant sucked into the first compression chamber, And the backflow prevention unit is installed in the first suction pipe. 15. The method of claim 14, The middle of the first suction pipe is bent in a reverse U-shape, the backflow prevention unit is installed in a portion that is bent in a reverse U-shape of the first suction pipe. The method of claim 11, An accumulator disposed on the suction side of the air conditioning cycle to expand and depressurize the refrigerant before the refrigerant flows into the first compression chamber and the second compression chamber, and one end of the accumulator protrudes into the accumulator, 1 further comprising a first suction pipe for guiding the refrigerant sucked into the compression chamber, And the backflow prevention unit is installed at one end of the first suction pipe protruding into the accumulator. 11. The method of claim 10, The air conditioning cycle further includes a first cylinder in which the first compression chamber is formed and a first suction port is formed at one side thereof to allow the refrigerant to be sucked into the first compression chamber. And the backflow prevention unit is installed at the first suction port. delete

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